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Part I Page lj of 19 Permit No. CO-0027146 B. MONITORING REQUIREMENTS 9. WET Conctol Program If required pursuant co Part I.B. of this permit, the permittee shall develop a control program co eliminate WET, through the identification and elimination of any toxicants or toxicant sources responsible for WET, or through the identification and implementation of toxicant treacabilicy processes. The control program, along with any cost/benefit analysis to determine whether the costs of construction bear a reasonable relationship to the resulting benefits, shall be submitted within the specified time frames. Such cost benefit analysis shall be used in accordance with Section 25-8-503(8) and (9), C.R.S. The control program, as submitted co or revised by the Division, may be incorporated into the permit. A control program may include, but shall not be limited co: additional pretreatment requirements imposed on specific indirect permittees by POTW's, modification of internal source control programs by industries, modifications of treatment plants, end/or best management practices for spills, leaks, erc. 10. WET Toxicity Incident Closure If WET is controlled through implementation of numeric limits for specific toxicants, through a ccncrol program eliminating toxicants from the waste stream, or through the implementation of creacmectc processes, of if 'd ET disappears and Division required accelerated testing demons Crates the continued absence of toxicity, the toxicity incident response shall be considered closed and normal quarterly monitoring shall resume. I£ the permittee completes all required phases of the toxicity incident response specified in compliance schedules, and is unable either co identify the causative toxicants and their sources or co identify feasible treatment options, the permittee may petition the Division for relief from further investigation and testing, consistent with the permit regulations. 11. FreQUencv and Sample Tvoe - Chronic WET Testing The monitoring frequency for chronic toxic icy tests shall be once every six months on a January June, July - December sequence, and cannot coincide with acute testing. Chronic tests will be static replacement tests using three composite effluent samples, each of which is to be composiced for a minimum of eight hours. Chronic testing will be conducted with both Ceriodaohnia sp. and fathead minnows during the first year, During years t•ao and three, if requested in writing by the permittee, the Divsion may grant relief from continued two species testing. Such relief shall be for continued Cescing with only that species which has demons traced the greatest sensitivity during the first year of testing.